Scenario: You want to make your own nodelet which behaves exactly like a real nodelet,
to contain certain custom content.
(We'll call this content B, for Body.)

Solution: Edit your Free Nodelet and duplicate the same form of
"separator" html which occurs between actual nodelets.

Implementation: View the html source and see what stuff goes between each nodelet.
(We'll call this stuff H, for Header.)
Put B at the bottom of your Free Nodelet, and put Hjust above it.
Be sure to customize the content of H for titles, IDs, etc.

For example, if you wanted to make a "real" nodelet out of your
Mini Super Search form, you could put the following H
above the form code: